Three of my Denton High School USCF-rated players know how to win king and pawn versus king, where White’s pawn is on e2, White's king is on e3 and Black’s king is on f5 with White to move. Each of them taught one small group (three to four other students) how to go from that starting position all the way to checkmate. I worked with one late-arriving student one-on-one on the same task. The rated players seemed to enjoy training the others in this important endgame.